Legal claims defining the scope of protection. Each claim is shown in both the original legal language and a plain English translation.
1. A method, comprising: generating, by a terminal device, a plurality of orthogonal frequency division multiplexing (OFDM) symbols; and sending, by the terminal device, at least two OFDM symbols of the plurality of OFDM symbols to a network device in a first time unit, and sending at least two OFDM symbols of the plurality of OFDM symbols to the network device in a second time unit, wherein phase offsets of OFDM symbols of the at least two OFDM symbols sent in the first time unit are equal to phase offsets of OFDM symbols of the at least two OFDM symbols sent in the second time unit, a phase offset of a first OFDM symbol sent in the first time unit is not equal to the phase offset of at least one OFDM symbol other than the first OFDM symbol sent in the first time unit, and a duration of the first time unit is the same as a duration of the second time unit; wherein for each OFDM symbol of the plurality of OFDM symbols, the phase offset of the respective OFDM symbol is a difference between a phase of a first time-domain sampling value at a first sampling time point when a first subcarrier mapping mode is used for the respective OFDM symbol and a phase of a second time-domain sampling value at the first sampling time point when a second subcarrier mapping mode is used for the same respective OFDM symbol.
This invention relates to wireless communication systems, specifically to methods for transmitting orthogonal frequency division multiplexing (OFDM) symbols in a manner that reduces phase discontinuities between time units. The problem addressed is the phase discontinuity that occurs when OFDM symbols are transmitted in different time units, which can degrade signal quality and system performance. The method involves generating multiple OFDM symbols and transmitting them in at least two distinct time units. In each time unit, at least two OFDM symbols are sent, with the phase offsets of the symbols in the first time unit matching those in the second time unit. Within a single time unit, however, the phase offset of one OFDM symbol differs from at least one other symbol. The time units have equal durations. The phase offset for each OFDM symbol is defined as the difference in phase between a time-domain sampling value at a specific sampling time point when two different subcarrier mapping modes are applied to the same symbol. This approach ensures phase continuity across time units while allowing controlled phase variations within a time unit, improving signal integrity and system efficiency.
2. The method according to claim 1 , wherein the duration of the first time unit is a duration of a slot corresponding to a subcarrier spacing of 15 kHz.
This invention relates to wireless communication systems, specifically methods for managing time units in wireless transmissions. The problem addressed is the need for precise timing alignment in wireless networks to ensure efficient data transmission and reception. The invention provides a method where the duration of a first time unit is set to match the duration of a slot corresponding to a subcarrier spacing of 15 kHz. This ensures compatibility with existing wireless standards, such as LTE and 5G NR, which use 15 kHz subcarrier spacing as a baseline. The method involves defining a time unit structure where the first time unit aligns with the slot duration of 15 kHz subcarrier spacing, which is typically 1 millisecond in length. This alignment helps synchronize transmissions between devices and base stations, reducing interference and improving spectral efficiency. The method may also include additional time units with different durations, but the first time unit is specifically tied to the 15 kHz subcarrier spacing to maintain backward compatibility and interoperability with legacy systems. The invention is particularly useful in scenarios where mixed deployments of different wireless technologies coexist, ensuring seamless operation across diverse network environments.
3. The method according to claim 1 , wherein the duration of the first time unit is a duration of a subframe.
A method for wireless communication involves managing time units in a network to improve synchronization and resource allocation. The method addresses the challenge of efficiently coordinating transmissions in wireless systems where precise timing is critical for avoiding interference and ensuring reliable data delivery. The method defines a first time unit with a specific duration, which is set to match the duration of a subframe. A subframe is a standardized time interval in wireless communication protocols, typically used to structure data transmission and reception. By aligning the first time unit with a subframe, the method ensures compatibility with existing network protocols and simplifies synchronization between devices. The method also includes a second time unit, which may have a different duration, allowing for flexible scheduling of transmissions. The method further involves determining a relationship between the first and second time units, such as their relative timing or duration, to optimize resource allocation and reduce latency. This approach enhances the efficiency of wireless communication by aligning time units with established subframe structures while allowing for adaptable scheduling. The method is particularly useful in systems where precise timing and synchronization are essential, such as 5G and other advanced wireless networks.
4. The method according to claim 1 , wherein: in the first subcarrier mapping mode, a subcarrier center is mapped to a carrier frequency, and in the second subcarrier mapping mode, the subcarrier center is mapped to a frequency that has a preset offset value with the carrier frequency.
5. The method according to claim 4 , wherein the preset offset value is 7.5 kHz.
This invention relates to wireless communication systems, specifically methods for managing frequency offsets in signal transmission. The problem addressed is the need to precisely control frequency offsets to ensure accurate signal synchronization and reduce interference in wireless networks. The method involves adjusting a frequency offset in a transmitted signal by applying a preset offset value. The preset offset value is specifically set to 7.5 kHz to optimize signal performance. This adjustment is part of a broader process that includes generating a signal, modulating it, and transmitting it with the adjusted frequency offset. The method ensures that the transmitted signal maintains proper alignment with receiving devices, minimizing errors and improving communication reliability. The preset offset value of 7.5 kHz is chosen to balance signal integrity and system efficiency, particularly in scenarios where precise frequency control is critical. This adjustment may be applied in various wireless communication protocols, including those used in cellular networks, IoT devices, or other radio-frequency applications. The method helps mitigate issues such as frequency drift, interference, and synchronization errors, enhancing overall system performance.
6. A method, comprising: receiving, by a network device, a plurality of orthogonal frequency division multiplexing (OFDM) symbols from a terminal device, wherein at least two OFDM symbols of the plurality of OFDM symbols are received in a first time unit, and at least two OFDM symbols of the plurality of OFDM symbols are received in a second time unit, wherein phase offsets of OFDM symbols of the at least two OFDM symbols received in the first time unit are equal to phase offsets of OFDM symbols of the at least two OFDM symbols received in the second time unit, a phase offset of a first OFDM symbol received in the first time unit is not equal to a phase offset of at least one OFDM symbol other than the first OFDM symbol received in the first time unit, and a duration of the first time unit is the same as a duration of the second time unit; and demodulating, by the network device, the plurality of OFDM symbols; wherein for each OFDM symbol of the plurality of OFDM symbols, the phase offset of the respective OFDM symbol is a difference between a phase of a first time-domain sampling value at a first sampling time point when a first subcarrier mapping mode is used for the respective OFDM symbol and a phase of a second time-domain sampling value at the first sampling time point when a second subcarrier mapping mode is used for the same respective OFDM symbol.
7. The method according to claim 6 , wherein the duration of the first time unit is a duration of a slot corresponding to a subcarrier spacing of 15 kHz.
8. The method according to claim 6 , wherein the duration of the first time unit is a duration of a subframe.
A method for wireless communication involves managing time units in a network to improve synchronization and resource allocation. The method addresses challenges in coordinating transmissions between devices in a wireless system, particularly in scenarios where precise timing is critical for efficient data exchange. The method includes defining a first time unit with a duration equal to that of a subframe, which is a standardized time interval in wireless communication protocols. This subframe duration is used to structure and synchronize communication activities, ensuring that devices operate in alignment with network timing requirements. The method may also involve adjusting or configuring other time units based on the subframe duration to optimize performance. By using subframe-based timing, the method enhances synchronization accuracy, reduces latency, and improves overall system efficiency in wireless networks. The approach is particularly useful in systems where subframes are a fundamental unit for scheduling and resource allocation, such as in cellular networks or other time-division multiplexed systems. The method ensures that devices can reliably coordinate their operations within the defined subframe boundaries, supporting seamless communication and data transfer.
9. The method according to claim 6 , wherein: in the first subcarrier mapping mode, a subcarrier center is mapped to a carrier frequency, and in the second subcarrier mapping mode, the subcarrier center is mapped to a frequency that has a preset offset value with the carrier frequency.
This invention relates to wireless communication systems, specifically to methods for mapping subcarriers in orthogonal frequency-division multiplexing (OFDM) or similar modulation schemes. The problem addressed is the need for flexible subcarrier mapping to optimize performance in different communication scenarios, such as reducing interference or improving synchronization. The method involves two distinct subcarrier mapping modes. In the first mode, the center frequency of each subcarrier is directly aligned with the carrier frequency of the communication channel. This alignment ensures precise frequency synchronization between the transmitter and receiver, which is critical for maintaining orthogonality between subcarriers and minimizing inter-carrier interference. In the second mode, the subcarrier center is offset from the carrier frequency by a preset value. This offset can be used to mitigate interference from adjacent channels or to align with specific frequency planning requirements in the network. The offset may be fixed or configurable, allowing the system to adapt to varying conditions. The method also includes determining which mapping mode to use based on system requirements, such as interference levels, channel conditions, or network configuration. The selection may be dynamic, allowing the system to switch between modes as needed. This flexibility improves overall system performance by optimizing subcarrier placement for different operational scenarios.
10. The method according to claim 9 , wherein the preset offset value is 7.5 kHz.
This invention relates to wireless communication systems, specifically to techniques for managing frequency offsets in signal transmission. The problem addressed is the need to accurately compensate for frequency discrepancies between transmitting and receiving devices to ensure reliable data transmission. Frequency offsets can arise due to Doppler shifts, oscillator inaccuracies, or other environmental factors, leading to signal degradation and communication errors. The invention describes a method for adjusting a frequency offset in a communication system. A preset offset value is applied to compensate for the frequency difference between a transmitter and a receiver. The preset offset value is specifically set to 7.5 kHz, which is a predefined correction factor designed to align the transmission and reception frequencies. This adjustment ensures that the received signal is properly demodulated and decoded, improving communication reliability. The method involves determining the frequency offset between the transmitter and receiver, then applying the preset offset value to correct the discrepancy. The use of a fixed offset value simplifies the compensation process, reducing computational complexity while maintaining accuracy. This approach is particularly useful in systems where dynamic frequency tracking is impractical or where a standardized correction is sufficient. The invention may be applied in various wireless communication protocols, including but not limited to cellular networks, IoT devices, and satellite communications, where precise frequency alignment is critical for performance. By implementing this method, communication systems can achieve better synchronization, lower error rates, and improved overall efficiency.
11. A terminal device, comprising: a processor, configured to generate a plurality of orthogonal frequency division multiplexing (OFDM) symbols; and a communication port, configured to send at least two OFDM symbols of the plurality of OFDM symbols to a network device in a first time unit, and send at least two OFDM symbols of the plurality of OFDM symbols to the network device in a second time unit, wherein phase offsets of OFDM symbols of the at least two OFDM symbols sent in the first time unit are equal to phase offsets of OFDM symbols of the at least two OFDM symbols sent in the second time unit, a phase offset of a first OFDM symbol in the first time unit is not equal to a phase offset of at least one OFDM symbol other than the first OFDM symbol sent in the first time unit, and a duration of the first time unit is the same as a duration of the second time unit; wherein for each OFDM symbol of the plurality of OFDM symbols, the phase offset of the respective OFDM symbol is a difference between a phase of a first time-domain sampling value at a first sampling time point when a first subcarrier mapping mode is used for the respective OFDM symbol and a phase of a second time-domain sampling value at the first sampling time point when a second subcarrier mapping mode is used for the same respective OFDM symbol.
12. The terminal device according to claim 11 , wherein the duration of the first time unit is a duration of a slot corresponding to a subcarrier spacing of 15 kHz.
This invention relates to wireless communication systems, specifically to terminal devices configured for efficient time synchronization and data transmission in cellular networks. The problem addressed is optimizing time unit durations in wireless communication to improve synchronization and reduce latency, particularly in scenarios involving different subcarrier spacings. The terminal device includes a communication module that transmits and receives signals using time units of varying durations. A key feature is the use of a first time unit with a duration matching a slot corresponding to a 15 kHz subcarrier spacing. This ensures compatibility with legacy systems while supporting flexible scheduling. The device also includes a synchronization module that aligns transmission timing with a base station, ensuring accurate data exchange. Additionally, the terminal device may adjust the duration of the first time unit dynamically based on network conditions or subcarrier spacing configurations, enhancing adaptability. The invention further includes a control module that manages the selection and configuration of time units, ensuring efficient resource allocation. The terminal device may also support multiple subcarrier spacings, allowing operation in diverse network environments. By aligning the first time unit with a 15 kHz slot duration, the device maintains backward compatibility while enabling advanced features like low-latency communication. This approach improves synchronization accuracy and reduces signaling overhead, making it suitable for 5G and beyond networks.
13. The terminal device according to claim 11 , wherein the duration of the first time unit is a duration of a subframe.
14. The terminal device according to claim 11 , wherein: in the first subcarrier mapping mode, a subcarrier center is mapped to a carrier frequency, and in the second subcarrier mapping mode, the subcarrier center is mapped to a frequency that has a preset offset value with the carrier frequency.
15. The terminal device according to claim 14 , wherein the preset offset value is 7.5 kHz.
A terminal device is configured to receive and process signals in a wireless communication system, particularly in scenarios involving carrier aggregation or dual connectivity where multiple frequency bands are used. The device includes a receiver that adjusts its frequency tuning based on a preset offset value to mitigate interference or improve synchronization between different frequency bands. The preset offset value is specifically set to 7.5 kHz to optimize performance, ensuring accurate signal reception and minimizing errors. This adjustment compensates for frequency mismatches or drifts that may occur during signal transmission or reception, enhancing the reliability of data communication. The terminal device may also include additional components such as a processor to analyze received signals and a memory to store configuration parameters, including the preset offset value. The device operates in environments where precise frequency alignment is critical, such as in 5G or LTE networks, to maintain stable connections and reduce latency. The preset offset value of 7.5 kHz is selected based on empirical data or system requirements to achieve optimal performance under varying conditions.
16. A network device, comprising: a communication port, configured to receive a plurality of orthogonal frequency division multiplexing OFDM symbols from a terminal device, wherein at least two OFDM symbols of the plurality of OFDM symbols are received in a first time unit, and at least two OFDM symbols of the plurality of OFDM symbols are received in a second time unit, wherein phase offsets of OFDM symbols of the at least two OFDM symbols received in the first time unit are equal to phase offsets of OFDM symbols of the at least two OFDM symbols received in the second time unit, a phase offset of a first OFDM symbol received in the first time unit is not equal to a phase offset of at least one OFDM symbol other than the first OFDM symbol received in the first time unit, and a duration of the first time unit is the same as a duration of the second time unit; and a processor, configured to demodulate the plurality of OFDM symbols; wherein for each OFDM symbol of the plurality of OFDM symbols, the phase offset of the respective OFDM symbol is a difference between a phase of a first time-domain sampling value at a first sampling time point when a first subcarrier mapping mode is used for the respective OFDM symbol and a phase of a second time-domain sampling value at the first sampling time point when a second subcarrier mapping mode is used for the same respective OFDM symbol.
17. The network device according to claim 16 , wherein the duration of the first time unit is a duration of a slot corresponding to a subcarrier spacing of 15 kHz.
18. The network device according to claim 16 , wherein the duration of the first time unit is a duration of a subframe.
A network device is configured to manage communication in a wireless network by dynamically adjusting transmission parameters based on time unit durations. The device includes a processor and a memory storing instructions that, when executed, cause the processor to determine a first time unit duration for transmitting data to a user equipment (UE) and a second time unit duration for receiving data from the UE. The first and second time unit durations may differ, allowing for flexible scheduling. The device also adjusts transmission parameters, such as modulation and coding schemes, based on the determined time unit durations to optimize communication efficiency. Additionally, the device may transmit control information to the UE, indicating the time unit durations and transmission parameters. In one embodiment, the first time unit duration is equal to the duration of a subframe, a standard time interval in wireless communication systems. This dynamic adjustment helps improve resource utilization and adapt to varying channel conditions, enhancing overall network performance. The device may also support multiple transmission modes, including downlink and uplink transmissions, and may coordinate with other network devices to ensure synchronized communication. The system is particularly useful in scenarios requiring high reliability and low latency, such as industrial IoT or mission-critical applications.
19. The network device according to claim 16 , wherein: in the first subcarrier mapping mode, a subcarrier center is mapped to a carrier frequency, and in the second subcarrier mapping mode, the subcarrier center is mapped to a frequency that has a preset offset value with the carrier frequency.
20. The network device according to claim 19 , wherein the preset offset value is 7.5 kHz.
A network device is configured to manage frequency synchronization in a communication system, particularly in scenarios where precise timing is critical, such as in wireless networks or distributed antenna systems. The device includes a synchronization module that adjusts a local oscillator frequency based on a received reference signal to minimize phase and frequency errors. The adjustment is performed using a preset offset value, which compensates for inherent system delays or environmental factors that could otherwise degrade synchronization accuracy. In this specific implementation, the preset offset value is set to 7.5 kHz, ensuring that the local oscillator frequency is finely tuned to match the reference signal's frequency with high precision. This adjustment helps maintain stable communication links, reduces interference, and improves overall system performance by mitigating timing discrepancies between network nodes. The device may also include additional features, such as error detection and correction mechanisms, to further enhance synchronization reliability. The use of a fixed offset value simplifies calibration and deployment while ensuring consistent performance across different operating conditions. This solution is particularly useful in environments where dynamic frequency adjustments are impractical or where minimal hardware complexity is desired.
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March 2, 2021
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